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Updated: May 25, 2025
Does it not break and grind down to powder the ramparts of coral? Clumsy and ill-shaped as it appears to be in other respects, it has jaws of wonderful design, and known to the ancients as "Aristotle's lantern." They are composed of five strips of bony substance, with enamel-like tips overlying each other in the centre of the disc-shaped mouth.
A red, quartzose, fine-grained conglomerate, with grains of quartz, and with patches of white earthy feldspar, apparently due to some process of concretionary crystalline action; this bed is more compact and metamorphosed than any of the overlying conglomerates. 5th. A whitish cherty limestone, with nodules of bluish argillaceous limestone. 6th.
The fifty sunburnt and windsoiled huts which compose the settlement, are built upon a bank of sand overlying the normal limestone: at the time when I visited it, the male population had emigrated en masse to Berberah. It is principally supported by the slave trade, the Arabs preferring to ship their purchases at some distance from the chief emporium. Lieut.
In order that the overlying gravel may be removed as cheaply as possible, water is supplied by means of ditches, often many miles long. From some near-by hill the stream is conducted down to the mine in strong iron pipes. It thus acquires a great force, and when directed against a gravel bank rapidly washes it away.
These circumstances are unfavourable for ascertaining the part which worms have played in the burial of the ruins; but as careful sections of the rubbish overlying an ancient town have seldom or never before been made in England, I will give copies of the most characteristic portions of some of those made by Mr. Joyce. They are of too great length to be here introduced entire.
In the rocks of the larger intrusive masses one may see with a powerful microscope exceedingly minute cavities, to be counted by many millions to the cubic inch, in which the gaseous water which the mass contained was held imprisoned under the immense pressure of the overlying rocks.
Thus, for example, a deposit near Shrewsbury, probably formed in brackish water, has been described by Sir R. Murchison as the youngest member of the coal-measures of that district, at the point where they are in contact with the overlying Permian group.
We passed over some good land at the roadside, some green fields in the valleys, but there is a very great deal of waste and also of barren land. A great deal of the tilled land is bog, a good deal of the waste land is shallow earth overlying rocks, some is cumbered with great boulders, and rough with heather and whins.
In the employment of X-rays and of radium in the treatment of cancer, experience is required, not only to obtain the maximum effect of the rays, but to avoid damage to the adjacent and overlying tissues. Ray treatment is not to be looked upon as a rival but as a powerful supplement to the operative treatment of cancer.
It would be easy to multiply instances of similar unconformability in formations of other ages; but a few more will suffice. The carboniferous rocks before alluded to as horizontal on the borders of Wales are vertical in the Mendip hills in Somersetshire, where the overlying beds of the New Red Sandstone are horizontal.
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